Waterbury, Connecticut Weather
Apples hang heavy on the branch. Day 93 of summer. Read this microseason across nine climate regions →
Waterbury weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 10:23 AM EDT · Open-Meteo
- TodaySep 21Overcast later12%—65°55°—
- TuesdaySep 22Overcast——63°49°-2°
- WednesdaySep 23Overcast——64°47°+1°
- ThursdaySep 24Overcast21%—66°45°+2°
- FridaySep 25Overcast51%—71°49°+5°
- SaturdaySep 26Overcast46%—73°49°+2°
- SundaySep 27Overcast33%—75°51°+2°
Air quality now AQI 24 · Good
AQI 24 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 33 now. With UV 4.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33 now. With UV 4.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19.
- Present
- AQI 33
- UV peak
- 4.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 19
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:28 PM
- Moonset
- 1:05 AM
- In sign
- ♑︎ Capricorn
Apples hang heavy on the branch
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Waterbury at a glance
- Today vs. normal: Today averages 60°F (high 65°F, low 55°F), 2°F below the 62°F normal for Sep 21
- Last frost: April 26 (1991–2020 median, NOAA station 18 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Waterbury
- Mon65°55°12%
- Tue63°49°1%
- Wed64°47°1%
- Thu66°45°21%
- Fri71°49°51%
- Sat73°49°46%
- Sun75°51°33%
- Mon75°53°21%
- Tue71°52°14%
- Wed70°55°24%
- Thu74°58°22%
- Fri69°50°18%
- Sat67°47°19%
- Sun71°53°23%
- Mon71°52°24%
- Tue57°41°20%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Waterbury
Interactive wind and temperature map centered on Waterbury — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 16) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Waterbury
Waterbury sits in Naugatuck Valley County, where the year’s longest day runs 15h 11m of daylight and its shortest just 9h 10m — a swing of +6h 2m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Hartford, the state’s largest city, lies about 23 miles to the NE. The nearest town Waterbury tracks is New Haven, roughly 18 miles to the SSE.
Air quality in Waterbury
Air quality in Waterbury’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 41). See the full air-quality history for Waterbury.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | radishes |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
Waterbury's warmest month is July (~73°F mean) and its coldest is January (~28°F). Rainfall peaks in October (4.5 inches) and bottoms out in February (2.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 28° | 3.0″ | 5 |
| February | 30° | 2.9″ | 5 |
| March | 38° | 4.0″ | 6 |
| April | 49° | 4.1″ | 7 |
| May | 59° | 3.5″ | 7 |
| June | 68° | 4.0″ | 7 |
| July | 73° | 3.4″ | 6 |
| August | 72° | 3.5″ | 6 |
| September | 65° | 4.3″ | 5 |
| October | 53° | 4.5″ | 6 |
| November | 42° | 3.4″ | 6 |
| December | 33° | 4.1″ | 7 |
Regional context
Similar climates Oakville, CT, Naugatuck, CT, Plantsville, CT
Waterbury's climate, from NOAA NCEI 1991-2020 station normals, pairs 28°F Januarys with 73°F Julys — a 45°F swing. About 44.9 inches of precipitation falls over roughly 74 days a year.
No season owns Waterbury's rain: October reaches 4.5 inches across 6.3 days and February keeps 2.9 inches on 5.4, an even spread through Waterbury's year. It is a balanced pattern Waterbury shares with places like Oakville, CT, Naugatuck, CT and Plantsville, CT.
The cool-season window in Waterbury starts at April 26, when nights stop freezing — think kale, peas, spinach, and parsnips. Hold Waterbury's tender crops — tomatoes, peppers, basil — until 10-14 days past Waterbury's last frost. Around October 16, freezing nights resume in Waterbury and tender crops must come in. In about half of years, Waterbury's last freeze comes after April 26.
Similar climates: Oakville, CT, Naugatuck, CT, Plantsville, CT, Cheshire Village, CT, Terryville, CT.
Frequently asked
- When does it freeze in Waterbury?
- Waterbury's last spring frost lands near April 26, and in Waterbury the first fall frost follows around October 16.
- What is the rainy season in Waterbury?
- October is the wettest month in Waterbury, about 4.5 inches on average; the year totals roughly 45 inches.
- What is the warmest month in Waterbury?
- July is Waterbury's warmest month, averaging about 73°F.
- What is the coldest month in Waterbury?
- Waterbury bottoms out in January, with a mean near 28°F.
- When can I start a vegetable garden in Waterbury?
- Waterbury's last frost (April 26) cues hardy greens; in Waterbury, hold heat-lovers two weeks past.
- How many rainy days does Waterbury get?
- Waterbury records around 74 days of measurable precipitation annually.
- What hardiness zone is Waterbury?
- Waterbury's USDA zone comes from its January mean (28°F); enter the ZIP on the USDA lookup for the number.
- What is the 10-day forecast for Waterbury?
- Waterbury's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Waterbury?
- See this week's day-by-day rain chances for Waterbury in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Waterbury?
- Current conditions for Waterbury and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Waterbury forecast updated?
- The Waterbury forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Waterbury?
- Today's sunrise and sunset times for Waterbury are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Waterbury?
- The next few days in Waterbury's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Waterbury sits at 41.6°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Waterbury
- 06701
- 06702
- 06703
- 06704
- 06705
- 06706
- 06708
- 06710
- 06720
- 06721
- 06722
- 06723
- 06724
- 06725
- 06726